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| Effects of biochar on ammonium nitrogen and nitrate nitrogen leaching from black soil under freeze-thaw cycle |
| Received:January 31, 2016 |
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| KeyWord:freeze and thaw;biochar;black soil;ammonium nitrogen;nitrate nitrogen |
| Author Name | Affiliation | E-mail | | LI Mei-xuan | Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, Changchun 130012, China | | | WANG Guan-zhu | Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, Changchun 130012, China | | | GUO Ping | Key Laboratory of Groundwater Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, Changchun 130012, China | guoping@jlu.edu.cn |
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| Abstract: |
| Leaching is one of important nitrogen loss pathways. Biochar may reduce the leaching because of huge surface area. Here a labo ratory column study was conducted to examine the effect of biochar applications on leaching of ammonium nitrogen and nitrate nitrogen in black soils from the Northeastern China under different freeze-thaw frequencies. Freezing-thawing increased nitrogen leaching, and the leaching amount was related to freeze-thaw frequency. Applying biochar effectively reduced the nitrogen leaching caused by freeze-thaw. Inorganic N leaching was reduced by 76.15%~85.79% and 55.26%~68.09%, respectively, by corn-stover and twigs biochars. Obviously, corn-stover biochar was more effective than twigs biochar did. At 3 and 1 of the freeze-thaw frequency, nitrogen fixation capacities of cornstover and twigs were respectively the highest. In addition, biochar effect on ammonium nitrogen was greater than on nitrate nitrogen. These fi ndings shed light on measures of reducing inorganic nitrogen leaching in black soil under freeze-thaw cycle. |
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